unit tests and pkg version commits

src/isnd/Data/PackageVersion.cs

@@ -1,5 +1,6 @@
 using System.ComponentModel.DataAnnotations;
 using System.ComponentModel.DataAnnotations.Schema;
+using isnd.Data.Catalog;
 using Newtonsoft.Json;
 
 namespace isnd.Data
@@ -30,6 +31,16 @@ namespace isnd.Data
         [JsonIgnore]
         public virtual Package Package { get; set; }
 
+        [Required][JsonIgnore]
+        public long CommitNId { get; set ; }
+
+        [NotMapped]
+
+        public string CommitId { get => CommitNId.ToString(); }
+
+        [ForeignKey("CommitNId")]
+
+        public virtual Commit LatestCommit{ get; set; }
         public string NugetLink => $"/package/{PackageId}/{FullString}/{PackageId}-{FullString}.nupkg";
         public string NuspecLink => $"/package/{PackageId}/{FullString}/{PackageId}-{FullString}.nuspec";